EP3978222A1 - Blow molding device - Google Patents
Blow molding device Download PDFInfo
- Publication number
- EP3978222A1 EP3978222A1 EP20814846.0A EP20814846A EP3978222A1 EP 3978222 A1 EP3978222 A1 EP 3978222A1 EP 20814846 A EP20814846 A EP 20814846A EP 3978222 A1 EP3978222 A1 EP 3978222A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blow nozzle
- blow
- nozzle
- mold
- preform
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000071 blow moulding Methods 0.000 title claims abstract description 67
- 239000012530 fluid Substances 0.000 claims abstract description 63
- 239000007788 liquid Substances 0.000 description 24
- 230000004048 modification Effects 0.000 description 10
- 238000012986 modification Methods 0.000 description 10
- 229920003002 synthetic resin Polymers 0.000 description 6
- 239000000057 synthetic resin Substances 0.000 description 6
- -1 polypropylene Polymers 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 239000003599 detergent Substances 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 239000002453 shampoo Substances 0.000 description 4
- 210000000078 claw Anatomy 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/58—Blowing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/28—Blow-moulding apparatus
- B29C49/30—Blow-moulding apparatus having movable moulds or mould parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/4205—Handling means, e.g. transfer, loading or discharging means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
- B65B3/02—Machines characterised by the incorporation of means for making the containers or receptacles
- B65B3/022—Making containers by moulding of a thermoplastic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C2049/4294—Sealing means
- B29C2049/4296—Sealing means for avoiding blowing fluid from leaking, e.g. between the blowing means and the preform neck
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
- B29C2049/4602—Blowing fluids
- B29C2049/465—Blowing fluids being incompressible
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
- B29C2049/4602—Blowing fluids
- B29C2049/465—Blowing fluids being incompressible
- B29C2049/4664—Blowing fluids being incompressible staying in the final article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/58—Blowing means
- B29C2049/5862—Drive means therefore
- B29C2049/5875—Electric direct drives, e.g. linear electric motor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/58—Blowing means
- B29C49/60—Blow-needles
- B29C2049/6054—Means for avoiding blowing fluid leakage between the blow needle and parisons or preforms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/08—Biaxial stretching during blow-moulding
- B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
- B29C49/12—Stretching rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/42403—Purging or cleaning the blow-moulding apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/4273—Auxiliary operations after the blow-moulding operation not otherwise provided for
- B29C49/4282—Purging or cleaning the article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/4284—Means for recycling or reusing auxiliaries or materials, e.g. blowing fluids or energy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/003—PET, i.e. poylethylene terephthalate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2101/00—Use of unspecified macromolecular compounds as moulding material
- B29K2101/12—Thermoplastic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Definitions
- This application relates to a blow molding apparatus that blow molds a synthetic resin preform into a container having a predetermined shape, in particular to a blow molding apparatus that uses an incompressible fluid, such as a liquid, as a pressurizing medium for performing blow molding.
- an incompressible fluid such as a liquid
- Synthetic resin containers are used to contain a variety of contents, such as beverages, cosmetics, pharmaceuticals, liquid detergents, or shampoo.
- PP polypropylene
- PET polyethylene terephthalate
- Such a container is typically manufactured by blow molding a synthetic resin preform into a predetermined shape using a blow molding apparatus, after the preform is heated to a temperature at which a stretching effect may be achieved.
- Blow molding apparatuses that use incompressible fluids, such as pressurized liquids, instead of pressurized air, as pressurizing media to be supplied into preforms are known.
- contents which are to be ultimately filled into containers as products may be used as pressurizing media.
- the step of filling contents into a container may be omitted, and the production process and the configuration of manufacturing apparatus may be simplified.
- Patent Literature (PTL) 1 describes a blow molding apparatus including a mold for blow molding, a blow nozzle configured to be disposed above the mold, a pressurized fluid supply unit configured to supply a pressurized liquid to the blow nozzle, and a blow nozzle moving unit configured to cause a relative movement of the blow nozzle between a connected position in which the blow nozzle is connected to a mouth tubular portion of a preform that has been placed in the mold and a standby position in which the blow nozzle is upward and away from the mouth tubular portion.
- the preform is molded into a container having a shape corresponding to a cavity of the mold, by supplying the pressurized liquid into the preform through the blow nozzle which is in the connected position.
- a liquid incompressible fluid
- a relatively highly viscous liquid such as shampoo or liquid detergent
- blow molding apparatus capable of preventing an incompressible fluid from dripping down from the blow nozzle and adhering to a molded container or a mold, after the container has been blow molded and the blow nozzle has been separated from the mouth tubular portion of the preform.
- blow molding apparatus including:
- the drawing port is open in a horizontal direction.
- the blow molding apparatus further includes:
- the saucer moving unit moves the saucer to below the blow nozzle.
- a blow molding apparatus capable of preventing an incompressible fluid from dripping down from the blow nozzle and adhering to a molded container or a mold, after the container has been blow molded and the blow nozzle has been separated from the mouth tubular portion of the preform can be provided.
- a blow molding apparatus 1 blow molds a synthetic resin preform 2, using an incompressible fluid, which is to be ultimately filled into a container, as a pressurizing medium.
- the container C having a predetermined shape for containing the incompressible fluid as the contents is manufactured.
- the blow molding apparatus 1 includes a mold 10 for blow molding.
- the mold 10 includes a cavity 11 that defines a molding surface.
- the cavity 11 of the mold 10 has a bottle shape with an opening 11a provided in its upper end, so that the opening 11a is open at an upper surface of the mold 10.
- the preform P can be placed (fitted) in the mold 10.
- a preform that integrally includes a test tube-shaped body P1 having a large-diameter upper portion and a cylindrical-shaped mouth tubular portion P3 is illustrated as being used.
- the preform also integrally includes an undercut portion P4 that is provided in an upper portion of the mouth tubular portion P3 and protrudes toward the outer side in the radial direction, and a neck ring P2 that is provided in a lower end of the mouth tubular portion P3 and extends toward the outer side in the radial direction.
- the preform P is placed in the mold 10 in an upright position, with the mouth tubular portion 3 being arranged on the upper side, so that the mouth tubular portion P3 protrudes above the upper surface of the mold 10 while the neck ring P2 is placed on the upper surface of the mold 10 and that the body P1 is positioned in the cavity 11 through the opening 11a. Additionally, the central axis of the preform P that has been placed in the mold 10 coincides with the central axis of the opening 11a.
- the mold 10 is configured to be opened into left and right mold halves along the central axis of the opening 11a. By opening the mold 10 into left and right mold halves, a molded container can be removed from the mold 10.
- the preform P is not limited to a preform with the above shape, and preforms with various shapes, which include the mouth tubular portion P3 and can be placed in the cavity 11 of the mold 10, may be used.
- the preform 2 for example, it is possible to use a preform that has been obtained by forming a thermoplastic synthetic resin material, which exhibits stretchability when being heated, into a desired shape by injection molding, compression molding, extrusion molding, or the like.
- the thermoplastic synthetic resin material may be polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE), or the like.
- a nozzle unit 20 is provided above the mold 10.
- the nozzle unit 20 includes a body block 21, and a blow nozzle 22 fixed to a lower end of the body block 21.
- the body block 21 is configured by combining a plurality of members, although a detailed description thereof will be omitted.
- a supply flow path 23 extending in the vertical direction.
- the supply flow path 23 has a lower end that is connected to the blow nozzle 22.
- the blow nozzle 22 includes a nozzle body 22a formed in a cylindrical shape having a smaller diameter than the inner diameter of the mouth tubular portion P3 of the preform P, and a large-diameter holding portion 22b integrally provided on the upper side of the nozzle body 22a. At the holding portion 22b, the blow nozzle 22 is held by and fixed to the inner surface of the body block 21. The blow nozzle 22 is coaxial with the opening 11a of the mold 10.
- blow nozzle 22 does not necessarily need to have a cylindrical shape, and may have various shapes, such as an elliptical or polygonal tube shape, by which the blow nozzle 22 can be connected to the mouth tubular portion P3 of the preform P.
- a pressurized fluid supply unit 30 is connected to the supply flow path 23.
- the pressurized fluid supply unit 30 may supply the incompressible fluid that has been pressurized to a predetermined pressure to the blow nozzle 22 through the supply flow path 23.
- the pressurized fluid supply unit 30 for example, it is preferable to use a configuration in which a plunger pump is used as a pressure source. It is, however, possible to use another configuration, by which the incompressible fluid that has been pressurized to a predetermined pressure can be supplied to the blow nozzle 22.
- the incompressible fluid that is to be supplied to the blow nozzle 22 by the pressurized fluid supply unit 30 for example, a relatively highly viscous liquid, such as shampoo or liquid detergent, may be used.
- the incompressible fluid is preferably an incompressible fluid having a viscosity of not more than 10000 mPa ⁇ s during its supply into the preform P.
- a seal body 24 is disposed in a manner such that it is movable in the vertical direction, so as to open and close the blow nozzle 22.
- a tapered lower end surface of the seal body 24 abuts against a tapered upper surface of the holding portion 22b of the blow nozzle 22, and the blow nozzle 22 is thus closed.
- the seal body 24 moves upward and away from the tapered upper surface of the holding portion 22b, the blow nozzle 22 is opened.
- the nozzle unit 20 is driven by a blow nozzle moving unit 40, so as to be raised and lowered along the central axis of the opening 11a.
- a blow nozzle moving unit 40 for example, it is possible to use a configuration in which a linear guide with a linear rail extending in the vertical direction and a slider movably arranged thereon is combined with a ball screw mechanism for converting rotational motion of an electric motor into linear motion. It is, however, possible to use another configuration.
- the blow nozzle 22 When the nozzle unit 20 is moved to its lower stroke end by the blow nozzle moving unit 40, the blow nozzle 22 is brought into its connected position (position illustrated in FIG. 2 ), in which the nozzle body 22a is inserted into the mouth tubular portion P3 of the preform P that has been placed in the mold 10, so as to be connected to the mouth tubular portion P3.
- the blow nozzle 22 is brought into its standby position (position illustrated in FIG. 1 ), in which the nozzle body 22a is positioned above and away from the mouth tubular portion P3 of the preform P that has been placed in the mold 10, so as to be disconnected from the mouth tubular portion P3.
- the body block 21 is provided, at a lower end thereof, with an annular-shaped sealing claw portion 25 that surrounds the outer periphery of the nozzle body 22a.
- the sealing claw portion 25 abuts against an upper surface of the neck ring P2, so that the preform P is fixed and held in the mold 10.
- the blow molding apparatus 1 may also be configured to include a stretching rod 26 for stretching the preform P in its longitudinal direction.
- the stretching rod 26 is slidably fitted in a hole provided along the axial center of the seal body 24, and the stretching rod 26 is movable in the axial direction, that is, the vertical direction relative to the seal body 24.
- the preform P that has been placed in the mold 10 can be axially (longitudinally) stretched by the stretching rod 26 in the cavity 11, by moving the stretching rod 26 downward relative to the seal body 24.
- the blow molding apparatus 1 includes a drawing device 50.
- the drawing device 50 is used after blow molding of a container, so as to prevent the incompressible fluid from dripping down from the blow nozzle 22 and adhering to the molded container or the mold 10.
- the drawing device 50 is disposed beside the blow nozzle 22.
- the drawing device 50 has a drawing member 51, a drawing pump 52, and a drawing member moving unit 53.
- the drawing member 51 is formed of a pipe material including a drawing passage 51a, and the drawing member 51 has a drawing port 51b formed at its end. An end portion of the pipe member is bent in an L-shape along the horizontal direction, and the drawing port 51b is open in the horizontal direction.
- the drawing pump 52 is configured by a vacuum pump, and is connected to the drawing passage 51a at a base end of the drawing member 51.
- the drawing pump 52 can generate drawing force for drawing, into the drawing port 51b through the drawing passage 51a, the incompressible fluid that drips down from the blow nozzle 22.
- the drawing member moving unit 53 is configured by a cylinder with a guide.
- the drawing member moving unit 53 includes a cylinder body 53a, a piston rod 53b that makes advancing and retracting movements with respect to the cylinder body 53a, and a guide 53c that is fixed to an end of the piston rod 53b.
- the cylinder body 53a is fixed to the nozzle unit 20 using a fixing bracket 54.
- a holding plate 55 that is bent in an L-shape is fixed to the guide 53c, and the drawing member 51 is fixed to and held by the holding plate 55.
- an end of the drawing member 51 is positioned away from the holding plate 55 on the front side (that is closer to the mold 10) in the advancing and retracting direction of the piston rod 53b, and the drawing port 51b faces a direction that is perpendicular to the advancing and retracting direction of the piston rod 53b.
- the drawing member moving unit 53 can cause the drawing member 51 to move from beside the blow nozzle 22 to its drawing position in which the drawing port 51b is positioned below the blow nozzle 22, by causing the piston rod 53b to make an advancing movement to the front side with respect to the cylinder body 53a.
- the drawing member moving unit 53 is configured by a cylinder with a guide, the present disclosure is not limited to this example, and various configurations that allow the drawing member 51 to move can be used. Further, the drawing member moving unit 53 does not necessarily need to cause the drawing member 51 to move in a linear path and may cause it to move in a curved path.
- the blow molding apparatus 1 includes a preform feeding means for feeding the preform P to the mold 10, and a conveyor means for removing a molded container from the mold 10 and conveying it to the subsequent step.
- a preform feeding means and the conveyor means for example, a guided cylinder including a holder for holding a preform or a container therein may be used. It is however also possible to use those with various configurations. Additionally, without using the preform feeding means and the conveyor means, an operator may manually perform the feeding of a preform or cap or the removal of a container.
- the drawing member 51 may be configured to be positioned below the blow nozzle 22 while the drawing pump 52 is being operated, until immediately before the blow nozzle 22 starts to move from its standby position to its connected position so as to be connected to the mouth tubular portion P3 of the preform P. In this case, the drawing member 51 may be configured to move to beside the blow nozzle 22 thereafter.
- the blow nozzle 22 is moved downward to its connected position by the blow nozzle moving unit 40, so that the blow nozzle 22 is connected to the mouth tubular portion P3 of the preform P.
- the seal body 24 is raised so as to open the blow nozzle 22, while the stretching rod 26 is lowered to thereby stretch the preform P in the longitudinal direction.
- a pressurized incompressible fluid is therefore supplied into the preform P from the pressurized fluid supply unit 30 through the blow nozzle 22 that is in its connected position.
- the preform P is subject to biaxial stretch blow molding and molded into a container C having a predetermined shape conforming to the shape of the cavity 11 of the mold 10.
- the stretching rod 26 is raised, the blow nozzle 22 is closed by the seal body 24, and the supply of the pressurized incompressible fluid from the pressurized fluid supply unit 30 to the blow nozzle 22 is stopped. Then, the blow nozzle 22 is driven upward by the blow nozzle moving unit 40, so that the blow nozzle 22 is moved from its connected position to its standby position.
- the drawing member 51 is moved forward toward a position below the blow nozzle 22 by the drawing member moving unit 53, so that the drawing port 51b is positioned below the blow nozzle 22.
- the drawing port 51b may be disposed on the central axis of the blow nozzle 22, the drawing port 51b is preferably disposed at a position a predetermined distance apart from the central axis of the blow nozzle 22 in the horizontal direction.
- the predetermined distance between the drawing port 51b and the central axis O of the blow nozzle 22 is appropriately changed in accordance with the drawing force generated in the drawing port 51b, the viscosity and amount of the incompressible fluid, or the like.
- the drawing member 51 may start to move after the blow nozzle 22 has moved to its standby position, or may start to move while the blow nozzle 22 is moving from its connected position to its standby position.
- drawing pump 52 is operated so as to apply drawing force to the drawing port 51b.
- the drawing pump 52 may be operated after the drawing port 51b is positioned below the blow nozzle 22.
- the incompressible fluid can drip down from the blow nozzle 22 to which it has adhered.
- a relatively highly viscous liquid such as shampoo or liquid detergent
- the drawing port 51b of the drawing member 51 which generates drawing force, is positioned below the blow nozzle 22. Accordingly, even when the incompressible fluid adheres to the blow nozzle 22 during blow molding and drips down from the blow nozzle 22 when it is moved to its standby position, the dripped down incompressible fluid can be drawn into the drawing passage 51a of the drawing member 51 through the drawing port 51b. Thus, the dripping down onto the molded container C or the mold 10 can be prevented.
- the drawing port 51b of the drawing member 51 which generates drawing force, is positioned below the blow nozzle 22. Accordingly, even when the incompressible fluid drips down from the blow nozzle 22 that is moved to its standby position, it is possible to prevent the dripped down incompressible fluid from adhering to the molded container C or the mold 10.
- the drawing port 51b of the drawing member 51 is caused to open in the horizontal direction, and therefore, the incompressible fluid can be drawn into the drawing passage 51a of the drawing member 51 from the side when it is dripping down from the blow nozzle 22.
- the incompressible fluid that drips down from the blow nozzle 22 can be drawn into the drawing passage 51a of the drawing member 51, and at the same time, the incompressible fluid that drips down from the blow nozzle 22 can be prevented from adhering to the drawing member 51. Accordingly, the adhesion of the incompressible fluid to the drawing member 51 can be prevented, so that the blow molding apparatus 1 will not be spoiled.
- the mold 10 is opened, and the molded container C is removed and conveyed to the next step.
- the blow molding apparatus 1 may be equipped with a cap fitting mechanism, and a cap may be fitted to the mouth tubular portion of the container C in a state in which the container C is placed in the mold 10.
- FIG. 8 illustrates a blow molding apparatus including a liquid receiving device according to a modification
- FIG. 9 illustrates the blow molding apparatus in a state in which a drawing member has been moved so that a drawing port is positioned below a blow nozzle and a saucer has been moved to below the blow nozzle, after a container has been molded and the blow nozzle has been moved from its connected position to its standby position.
- the same reference numerals are assigned to the members corresponding to those described above.
- the blow molding apparatus 1 may be configured to include a liquid receiving device 60, in addition to the drawing device 50.
- the liquid receiving device 60 has a saucer 61 and a saucer moving unit 62.
- the saucer moving unit 62 is configured by a cylinder with a guide.
- the saucer moving unit 62 includes a cylinder body 62a, a piston rod 62b that makes advancing and retracting movements with respect to the cylinder body 62a, and a guide 62c fixed to an end of the piston rod 62b.
- the cylinder body 62a is fixed to the nozzle unit 20 using a fixing bracket 63.
- the saucer 61 is formed in a flat plate shape with a base end portion formed as an L-shape bent portion, at which the saucer 61 is fixed to the guide 62c.
- the saucer moving unit 62 operates to move the saucer 61 to below the blow nozzle 22 on the lower side of the drawing member 51, after the container C has been molded and the blow nozzle 22 has been moved from its inserted position to its standby position.
- the saucer moving unit 62 operates to move the saucer 61 to below the blow nozzle 22, after the drawing member moving unit 53 has moved the drawing member 51 so that the drawing port 51b is positioned below the blow nozzle 22.
- the blow molding apparatus 1 since the blow molding apparatus 1 according to the modification includes the liquid receiving device 60, in addition to the drawing device 50, even when the incompressible fluid adheres to the blow nozzle 22 during blow molding and drips down from the blow nozzle 22 when it is moved to its standby position, the dripped down incompressible fluid can be drawn into the drawing passage 51a of the drawing member 51 through the drawing port 51b. Besides, the saucer 61 receives the incompressible fluid when it has dripped down after failing to be drawn by the drawing member 51. In this way, the dripping down of the incompressible fluid onto the molded container C or the mold 10 can be prevented even more reliably.
- the saucer moving unit 62 moves the saucer 61 to below the blow nozzle 22. Accordingly, it is possible to ensure that the timing of the movement of the saucer 61 to below the blow nozzle 22 is after the dripping down of the incompressible fluid has been addressed at an early stage by the drawing member 51 drawing the incompressibility fluid that drips down from the blow nozzle 22.
- the movement of the saucer 61 to below the blow nozzle 22 is timed to coincide with the incompressible fluid, which runs in the thin stream, having being drawn by the drawing member 51 and cut off.
- the incompressible fluid is prevented from adhering to a lower surface or the like of the saucer 61 and dripping down onto the molded container C or the mold 10.
- FIG. 10 is a sectional view illustrating a blow nozzle according to a modification.
- the same reference numerals are assigned to members corresponding to those described above.
- the blow nozzle 22 may be configured to include drawing holes 70 on its inner peripheral surface.
- the inner peripheral surface of the blow nozzle 22 is provided with a plurality of drawing holes 70 that is arranged at an interval in the circumferential direction and that is also arranged at an interval in the axial direction.
- drawing holes 70 are each connected to a drawing pump 72 via a flow passage 71 provided between the blow nozzle 22 and the body block 21.
- the drawing pump 72 is configured by, for example, a vacuum pump, which can generate drawing force for drawing, into the respective drawing holes 70, the incompressible fluid adhered to the blow nozzle 22.
- the number or position of drawing holes 70 provided in the blow nozzle 22 can be appropriately changed.
- the blow nozzle 22 is provided with a plurality of auxiliary drawing holes 73, in addition to the plurality of drawing holes 70.
- the plurality of auxiliary drawing holes 73 is open side by side at an interval from one another in the circumferential direction on a lower end surface of the nozzle body 22a of the blow nozzle 22.
- Each auxiliary drawing hole 73 is connected to the drawing pump 72 through the flow passage 71, as is the case with each drawing hole 70.
- the drawing pump 72 can generate drawing force for drawing, into the respective drawing holes 70 and also into the respective auxiliary drawing holes 73, the incompressible fluid adhered to the blow nozzle 22.
- auxiliary drawing holes 73 provided in the blow nozzle 22 can be changed in various ways. Further, the blow nozzle 22 may be configured to be provided only with the drawing holes 70 or the auxiliary drawing holes 73.
- the incompressible fluid adhered to the blow nozzle 22 during blow molding can be drawn through the plurality of drawing holes 70 and auxiliary drawing holes 73. It is therefore possible to reduce the amount of the incompressible fluid that drips down from the blow nozzle 22 when it is moved to its standby position.
- the incompressible fluid can be even more reliably prevented from dripping down from the blow nozzle 22 and adhering to the molded container C or the mold 10, by ensuring that the incompressible fluid that drips down from the blow nozzle 22 when it is moved to its standby position can be drawn by the drawing member 51 of the drawing device 50.
- the blow nozzle moving unit 40 is configured to move the nozzle unit 20 or the blow nozzle 22 upward with respect to the mold 10
- the present disclosure is not limited to this example.
- the mold 10 may be configured to be moved downward with respect to the nozzle unit 20 or the blow nozzle 22.
- the nozzle unit 20 or the blow nozzle 22, and the mold 10 may be configured to be moved in a direction away from each other.
- blow molding apparatus 1 may be configured without the liquid receiving device 60, the drawing holes 70, or the auxiliary drawing holes 73.
- the blow molding apparatus 1 may be configured to perform a suck-back operation by which a predetermined amount of the incompressible fluid is sucked back from the inside of the molded container C toward the supply flow path 23, by operating the pressurized fluid supply unit 30 in an opposite direction after blow molding and immediately before the seal body 24 is closed.
- drawing device 50 and the liquid receiving device 60 are fixed to the nozzle unit 20
- the drawing device 50 and the liquid receiving device 60 may be fixed to a member or the like other than the nozzle unit 20.
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Abstract
Description
- This application relates to a blow molding apparatus that blow molds a synthetic resin preform into a container having a predetermined shape, in particular to a blow molding apparatus that uses an incompressible fluid, such as a liquid, as a pressurizing medium for performing blow molding.
- Synthetic resin containers, typical examples of which include polypropylene (PP) bottles and polyethylene terephthalate (PET) bottles, are used to contain a variety of contents, such as beverages, cosmetics, pharmaceuticals, liquid detergents, or shampoo. Such a container is typically manufactured by blow molding a synthetic resin preform into a predetermined shape using a blow molding apparatus, after the preform is heated to a temperature at which a stretching effect may be achieved.
- Blow molding apparatuses that use incompressible fluids, such as pressurized liquids, instead of pressurized air, as pressurizing media to be supplied into preforms are known. In this case, contents which are to be ultimately filled into containers as products may be used as pressurizing media. By doing so, the step of filling contents into a container may be omitted, and the production process and the configuration of manufacturing apparatus may be simplified.
- For example, Patent Literature (PTL) 1 describes a blow molding apparatus including a mold for blow molding, a blow nozzle configured to be disposed above the mold, a pressurized fluid supply unit configured to supply a pressurized liquid to the blow nozzle, and a blow nozzle moving unit configured to cause a relative movement of the blow nozzle between a connected position in which the blow nozzle is connected to a mouth tubular portion of a preform that has been placed in the mold and a standby position in which the blow nozzle is upward and away from the mouth tubular portion. In the described blow molding apparatus, the preform is molded into a container having a shape corresponding to a cavity of the mold, by supplying the pressurized liquid into the preform through the blow nozzle which is in the connected position.
- PTL 1:
JP 2013-208834 A - In a known blow molding apparatus as described in PTL 1, after a container has been blow molded and when the blow nozzle is raised to its standby position so as to be disconnected from the mouth tubular portion of the container, a liquid (incompressible fluid) can drip down from the surface of the blow nozzle to which it has adhered. In particular, in a case in which a relatively highly viscous liquid, such as shampoo or liquid detergent, is used as a pressurized medium for blow molding, it takes long for the dripping down of the liquid to start from the blow nozzle after blow molding, and moreover, the liquid continues to run in a thin stream for a while. Accordingly, the liquid is likely to drip down from the blow nozzle onto the molded container or the mold from which the molded container has been removed, thus causing the problem of spoiling them.
- It would be helpful to provide a blow molding apparatus capable of preventing an incompressible fluid from dripping down from the blow nozzle and adhering to a molded container or a mold, after the container has been blow molded and the blow nozzle has been separated from the mouth tubular portion of the preform.
- One aspect of the present disclosure resides in a blow molding apparatus including:
- a mold for blow molding;
- a blow nozzle configured to be disposed above the mold;
- a pressurized fluid supply unit configured to supply a pressurized incompressible fluid to the blow nozzle; and
- a blow nozzle moving unit configured to cause a relative movement of the blow nozzle between a connected position in which the blow nozzle is connected to a mouth tubular portion of a preform that has been placed in the mold and a standby position in which the blow nozzle is upward and away from the mouth tubular portion, wherein
- the preform is molded into a container having a shape corresponding to a cavity of the mold, by supplying the pressurized incompressible fluid into the preform through the blow nozzle which is in the connected position, the blow molding apparatus including:
- a drawing member including a drawing port;
- a drawing pump configured to be connected to the drawing member; and
- a drawing member moving unit configured to move the drawing member so that the drawing port is positioned below the blow nozzle, after the container has been molded and the blow nozzle has been moved from the connected position to the standby position.
- In a preferred embodiment of the blow molding apparatus configured as above, the drawing port is open in a horizontal direction.
- In another preferred embodiment of the blow molding apparatus configured as above, the blow molding apparatus further includes:
- a saucer; and
- a saucer moving unit configured to move the saucer to below the blow nozzle on a lower side of the drawing member, after the container has been molded and the blow nozzle has been moved from the connected position to the standby position.
- In still another preferred embodiment of the blow molding apparatus configured as above, after the drawing member moving unit has moved the drawing member so that the drawing port is positioned below the blow nozzle, the saucer moving unit moves the saucer to below the blow nozzle.
- According to the present disclosure, a blow molding apparatus capable of preventing an incompressible fluid from dripping down from the blow nozzle and adhering to a molded container or a mold, after the container has been blow molded and the blow nozzle has been separated from the mouth tubular portion of the preform can be provided.
- In the accompanying drawings:
-
FIG. 1 illustrates a blow molding apparatus according to an embodiment of the present disclosure; -
FIG. 2 is an enlarged sectional view illustrating a portion of the blow molding apparatus ofFIG. 1 ; -
FIG. 3 is a plan view illustrating a mold and a drawing device ofFIG. 1 ; -
FIG. 4 illustrates the blow molding apparatus in a state in which a blow nozzle has been moved from its standby position to its connected position; -
FIG. 5 illustrates the blow molding apparatus in a state in which a preform is being blow molded; -
FIG. 6 illustrates the blow molding apparatus in a state in which a drawing member has been moved so that a drawing port is positioned below the blow nozzle, after a container has been molded and the blow nozzle has been moved from its connected position to its standby position; -
FIG. 7 is a plan view illustrating a positional relationship between the mold and the drawing device in the state ofFIG. 6 ; -
FIG. 8 illustrates a blow molding apparatus including a liquid receiving device according to a modification; -
FIG. 9 illustrates the blow molding apparatus in a state in which a drawing member has been moved so that a drawing port is positioned below a blow nozzle and in which a saucer has been moved to below the blow nozzle, after a container has been molded and the blow nozzle has been moved from its connected position to its standby position; and -
FIG. 10 is a sectional view illustrating a blow nozzle according to a modification. - Hereinafter, the present disclosure will be described by illustration in more detail with reference to the drawings.
- A blow molding apparatus 1 according to an embodiment of the present embodiment as illustrated in
FIG. 1 blow molds a synthetic resin preform 2, using an incompressible fluid, which is to be ultimately filled into a container, as a pressurizing medium. Thus, the container C having a predetermined shape for containing the incompressible fluid as the contents is manufactured. The blow molding apparatus 1 includes amold 10 for blow molding. - As illustrated in
FIG. 2 , themold 10 includes acavity 11 that defines a molding surface. Thecavity 11 of themold 10 has a bottle shape with anopening 11a provided in its upper end, so that theopening 11a is open at an upper surface of themold 10. - The preform P can be placed (fitted) in the
mold 10. In the present embodiment, as the preform P to be placed in themold 10, a preform that integrally includes a test tube-shaped body P1 having a large-diameter upper portion and a cylindrical-shaped mouth tubular portion P3 is illustrated as being used. The preform also integrally includes an undercut portion P4 that is provided in an upper portion of the mouth tubular portion P3 and protrudes toward the outer side in the radial direction, and a neck ring P2 that is provided in a lower end of the mouth tubular portion P3 and extends toward the outer side in the radial direction. In this case, the preform P is placed in themold 10 in an upright position, with the mouth tubular portion 3 being arranged on the upper side, so that the mouth tubular portion P3 protrudes above the upper surface of themold 10 while the neck ring P2 is placed on the upper surface of themold 10 and that the body P1 is positioned in thecavity 11 through theopening 11a. Additionally, the central axis of the preform P that has been placed in themold 10 coincides with the central axis of theopening 11a. - Although not illustrated in detail, the
mold 10 is configured to be opened into left and right mold halves along the central axis of theopening 11a. By opening themold 10 into left and right mold halves, a molded container can be removed from themold 10. - The preform P is not limited to a preform with the above shape, and preforms with various shapes, which include the mouth tubular portion P3 and can be placed in the
cavity 11 of themold 10, may be used. As the preform 2, for example, it is possible to use a preform that has been obtained by forming a thermoplastic synthetic resin material, which exhibits stretchability when being heated, into a desired shape by injection molding, compression molding, extrusion molding, or the like. The thermoplastic synthetic resin material may be polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE), or the like. - As illustrated in
FIG. 1 andFIG. 2 , anozzle unit 20 is provided above themold 10. Thenozzle unit 20 includes abody block 21, and ablow nozzle 22 fixed to a lower end of thebody block 21. In the present embodiment, thebody block 21 is configured by combining a plurality of members, although a detailed description thereof will be omitted. - As illustrated in
FIG. 2 , in thebody block 21, there is provided asupply flow path 23 extending in the vertical direction. Thesupply flow path 23 has a lower end that is connected to theblow nozzle 22. - The
blow nozzle 22 includes anozzle body 22a formed in a cylindrical shape having a smaller diameter than the inner diameter of the mouth tubular portion P3 of the preform P, and a large-diameter holding portion 22b integrally provided on the upper side of thenozzle body 22a. At the holdingportion 22b, theblow nozzle 22 is held by and fixed to the inner surface of thebody block 21. Theblow nozzle 22 is coaxial with theopening 11a of themold 10. - Additionally, the
blow nozzle 22 does not necessarily need to have a cylindrical shape, and may have various shapes, such as an elliptical or polygonal tube shape, by which theblow nozzle 22 can be connected to the mouth tubular portion P3 of the preform P. - A pressurized
fluid supply unit 30 is connected to thesupply flow path 23. The pressurizedfluid supply unit 30 may supply the incompressible fluid that has been pressurized to a predetermined pressure to theblow nozzle 22 through thesupply flow path 23. As the pressurizedfluid supply unit 30, for example, it is preferable to use a configuration in which a plunger pump is used as a pressure source. It is, however, possible to use another configuration, by which the incompressible fluid that has been pressurized to a predetermined pressure can be supplied to theblow nozzle 22. - As the incompressible fluid that is to be supplied to the
blow nozzle 22 by the pressurizedfluid supply unit 30, for example, a relatively highly viscous liquid, such as shampoo or liquid detergent, may be used. In this case, the incompressible fluid is preferably an incompressible fluid having a viscosity of not more than 10000 mPa·s during its supply into the preform P. - In the
supply flow path 23, aseal body 24 is disposed in a manner such that it is movable in the vertical direction, so as to open and close theblow nozzle 22. When theseal body 24 is moved to its lower stroke end, a tapered lower end surface of theseal body 24 abuts against a tapered upper surface of the holdingportion 22b of theblow nozzle 22, and theblow nozzle 22 is thus closed. On the other hand, when theseal body 24 moves upward and away from the tapered upper surface of the holdingportion 22b, theblow nozzle 22 is opened. - The
nozzle unit 20 is driven by a blownozzle moving unit 40, so as to be raised and lowered along the central axis of theopening 11a. As the blownozzle moving unit 40, for example, it is possible to use a configuration in which a linear guide with a linear rail extending in the vertical direction and a slider movably arranged thereon is combined with a ball screw mechanism for converting rotational motion of an electric motor into linear motion. It is, however, possible to use another configuration. - When the
nozzle unit 20 is moved to its lower stroke end by the blownozzle moving unit 40, theblow nozzle 22 is brought into its connected position (position illustrated inFIG. 2 ), in which thenozzle body 22a is inserted into the mouth tubular portion P3 of the preform P that has been placed in themold 10, so as to be connected to the mouth tubular portion P3. On the other hand, when thenozzle unit 20 is moved to its upper stroke end by the blownozzle moving unit 40, theblow nozzle 22 is brought into its standby position (position illustrated inFIG. 1 ), in which thenozzle body 22a is positioned above and away from the mouth tubular portion P3 of the preform P that has been placed in themold 10, so as to be disconnected from the mouth tubular portion P3. - As illustrated in
FIG. 2 , thebody block 21 is provided, at a lower end thereof, with an annular-shapedsealing claw portion 25 that surrounds the outer periphery of thenozzle body 22a. When thenozzle unit 20 is moved to its lower stroke end and thenozzle body 22a is connected to the mouth tubular portion P3 of the preform P, the sealingclaw portion 25 abuts against an upper surface of the neck ring P2, so that the preform P is fixed and held in themold 10. - The blow molding apparatus 1 may also be configured to include a stretching
rod 26 for stretching the preform P in its longitudinal direction. The stretchingrod 26 is slidably fitted in a hole provided along the axial center of theseal body 24, and the stretchingrod 26 is movable in the axial direction, that is, the vertical direction relative to theseal body 24. At the time of blow molding, the preform P that has been placed in themold 10 can be axially (longitudinally) stretched by the stretchingrod 26 in thecavity 11, by moving the stretchingrod 26 downward relative to theseal body 24. - As illustrated in
FIG. 1 , the blow molding apparatus 1 includes adrawing device 50. Thedrawing device 50 is used after blow molding of a container, so as to prevent the incompressible fluid from dripping down from theblow nozzle 22 and adhering to the molded container or themold 10. Thedrawing device 50 is disposed beside theblow nozzle 22. - As illustrated in
FIG. 1 andFIG. 3 , thedrawing device 50 has a drawingmember 51, adrawing pump 52, and a drawingmember moving unit 53. - The drawing
member 51 is formed of a pipe material including adrawing passage 51a, and the drawingmember 51 has a drawingport 51b formed at its end. An end portion of the pipe member is bent in an L-shape along the horizontal direction, and the drawingport 51b is open in the horizontal direction. - For example, the drawing
pump 52 is configured by a vacuum pump, and is connected to thedrawing passage 51a at a base end of the drawingmember 51. The drawingpump 52 can generate drawing force for drawing, into the drawingport 51b through thedrawing passage 51a, the incompressible fluid that drips down from theblow nozzle 22. - The drawing
member moving unit 53 is configured by a cylinder with a guide. The drawingmember moving unit 53 includes acylinder body 53a, apiston rod 53b that makes advancing and retracting movements with respect to thecylinder body 53a, and aguide 53c that is fixed to an end of thepiston rod 53b. Thecylinder body 53a is fixed to thenozzle unit 20 using a fixingbracket 54. - A holding
plate 55 that is bent in an L-shape is fixed to theguide 53c, and the drawingmember 51 is fixed to and held by the holdingplate 55. In a state in which the drawingmember 51 is fixed to and held by the holdingplate 55, an end of the drawingmember 51 is positioned away from the holdingplate 55 on the front side (that is closer to the mold 10) in the advancing and retracting direction of thepiston rod 53b, and the drawingport 51b faces a direction that is perpendicular to the advancing and retracting direction of thepiston rod 53b. - The drawing
member moving unit 53 can cause the drawingmember 51 to move from beside theblow nozzle 22 to its drawing position in which thedrawing port 51b is positioned below theblow nozzle 22, by causing thepiston rod 53b to make an advancing movement to the front side with respect to thecylinder body 53a. - Additionally, although in this embodiment the drawing
member moving unit 53 is configured by a cylinder with a guide, the present disclosure is not limited to this example, and various configurations that allow the drawingmember 51 to move can be used. Further, the drawingmember moving unit 53 does not necessarily need to cause the drawingmember 51 to move in a linear path and may cause it to move in a curved path. - Although an illustration is omitted, the blow molding apparatus 1 includes a preform feeding means for feeding the preform P to the
mold 10, and a conveyor means for removing a molded container from themold 10 and conveying it to the subsequent step. As the preform feeding means and the conveyor means, for example, a guided cylinder including a holder for holding a preform or a container therein may be used. It is however also possible to use those with various configurations. Additionally, without using the preform feeding means and the conveyor means, an operator may manually perform the feeding of a preform or cap or the removal of a container. - Next, a procedure for blow molding the preform P into a container having a predetermined shape using the blow molding apparatus 1 having the above configuration will be described.
- First, as illustrated in
FIG. 1 , in a state in which thenozzle unit 20 has been moved to its upper stroke end so that theblow nozzle 22 is in its standby position and in which the drawingmember 51 has been withdrawn to beside theblow nozzle 22, the preform P is placed in themold 10, and themold 10 is closed. Additionally, in a state in which the preform P has been placed in themold 10, the drawingmember 51 may be configured to be positioned below theblow nozzle 22 while thedrawing pump 52 is being operated, until immediately before theblow nozzle 22 starts to move from its standby position to its connected position so as to be connected to the mouth tubular portion P3 of the preform P. In this case, the drawingmember 51 may be configured to move to beside theblow nozzle 22 thereafter. - Subsequently, as illustrated in
FIG. 4 , theblow nozzle 22 is moved downward to its connected position by the blownozzle moving unit 40, so that theblow nozzle 22 is connected to the mouth tubular portion P3 of the preform P. - Subsequently, as illustrated in
FIG. 5 , theseal body 24 is raised so as to open theblow nozzle 22, while the stretchingrod 26 is lowered to thereby stretch the preform P in the longitudinal direction. A pressurized incompressible fluid is therefore supplied into the preform P from the pressurizedfluid supply unit 30 through theblow nozzle 22 that is in its connected position. Thus, the preform P is subject to biaxial stretch blow molding and molded into a container C having a predetermined shape conforming to the shape of thecavity 11 of themold 10. - When blow molding is complete, the stretching
rod 26 is raised, theblow nozzle 22 is closed by theseal body 24, and the supply of the pressurized incompressible fluid from the pressurizedfluid supply unit 30 to theblow nozzle 22 is stopped. Then, theblow nozzle 22 is driven upward by the blownozzle moving unit 40, so that theblow nozzle 22 is moved from its connected position to its standby position. - Subsequently, as illustrated in
FIG. 6 andFIG. 7 , the drawingmember 51 is moved forward toward a position below theblow nozzle 22 by the drawingmember moving unit 53, so that the drawingport 51b is positioned below theblow nozzle 22. At this time, although the drawingport 51b may be disposed on the central axis of theblow nozzle 22, the drawingport 51b is preferably disposed at a position a predetermined distance apart from the central axis of theblow nozzle 22 in the horizontal direction. In this case, the predetermined distance between the drawingport 51b and the central axis O of theblow nozzle 22 is appropriately changed in accordance with the drawing force generated in the drawingport 51b, the viscosity and amount of the incompressible fluid, or the like. Additionally, the drawingmember 51 may start to move after theblow nozzle 22 has moved to its standby position, or may start to move while theblow nozzle 22 is moving from its connected position to its standby position. - Further, the drawing
pump 52 is operated so as to apply drawing force to the drawingport 51b. Although it is preferable to operate thedrawing pump 52 in advance before the drawingport 51b is positioned below theblow nozzle 22, the drawingpump 52 may be operated after the drawingport 51b is positioned below theblow nozzle 22. - After the molding of the container C and when the
blow nozzle 22 is raised to its standby position, the incompressible fluid can drip down from theblow nozzle 22 to which it has adhered. In particular, in a case in which a relatively highly viscous liquid, such as shampoo or liquid detergent, is used as the incompressible fluid, it takes long for the dripping down of the incompressible fluid to start from theblow nozzle 22 after blow molding, and moreover, the incompressible fluid continues to run in a thin stream for a while. - In the blow molding apparatus 1 according to the present embodiment, however, after the container C has been molded and the
blow nozzle 22 has been moved from its connected position to its standby position, the drawingport 51b of the drawingmember 51, which generates drawing force, is positioned below theblow nozzle 22. Accordingly, even when the incompressible fluid adheres to theblow nozzle 22 during blow molding and drips down from theblow nozzle 22 when it is moved to its standby position, the dripped down incompressible fluid can be drawn into thedrawing passage 51a of the drawingmember 51 through the drawingport 51b. Thus, the dripping down onto the molded container C or themold 10 can be prevented. - Thus, in the blow molding apparatus 1 according to the present embodiment, after the container C has been molded and the
blow nozzle 22 has been moved from its connected position to its standby position, the drawingport 51b of the drawingmember 51, which generates drawing force, is positioned below theblow nozzle 22. Accordingly, even when the incompressible fluid drips down from theblow nozzle 22 that is moved to its standby position, it is possible to prevent the dripped down incompressible fluid from adhering to the molded container C or themold 10. - Further, in the blow molding apparatus 1 according to the present embodiment, the drawing
port 51b of the drawingmember 51 is caused to open in the horizontal direction, and therefore, the incompressible fluid can be drawn into thedrawing passage 51a of the drawingmember 51 from the side when it is dripping down from theblow nozzle 22. Thus, the incompressible fluid that drips down from theblow nozzle 22 can be drawn into thedrawing passage 51a of the drawingmember 51, and at the same time, the incompressible fluid that drips down from theblow nozzle 22 can be prevented from adhering to the drawingmember 51. Accordingly, the adhesion of the incompressible fluid to the drawingmember 51 can be prevented, so that the blow molding apparatus 1 will not be spoiled. - As described above, in the course of or after the drawing of the incompressible fluid that drips down from the
blow nozzle 22 using the drawingmember 51, themold 10 is opened, and the molded container C is removed and conveyed to the next step. Additionally, the blow molding apparatus 1 may be equipped with a cap fitting mechanism, and a cap may be fitted to the mouth tubular portion of the container C in a state in which the container C is placed in themold 10. -
FIG. 8 illustrates a blow molding apparatus including a liquid receiving device according to a modification, andFIG. 9 illustrates the blow molding apparatus in a state in which a drawing member has been moved so that a drawing port is positioned below a blow nozzle and a saucer has been moved to below the blow nozzle, after a container has been molded and the blow nozzle has been moved from its connected position to its standby position. Note that inFIG. 8 andFIG. 9 the same reference numerals are assigned to the members corresponding to those described above. - As illustrated in
FIG. 8 , the blow molding apparatus 1 according to the modification may be configured to include aliquid receiving device 60, in addition to thedrawing device 50. Theliquid receiving device 60 has asaucer 61 and asaucer moving unit 62. - The
saucer moving unit 62 is configured by a cylinder with a guide. Thesaucer moving unit 62 includes acylinder body 62a, apiston rod 62b that makes advancing and retracting movements with respect to thecylinder body 62a, and aguide 62c fixed to an end of thepiston rod 62b. Thecylinder body 62a is fixed to thenozzle unit 20 using a fixingbracket 63. - The
saucer 61 is formed in a flat plate shape with a base end portion formed as an L-shape bent portion, at which thesaucer 61 is fixed to theguide 62c. - As illustrated in
FIG. 9 , thesaucer moving unit 62 operates to move thesaucer 61 to below theblow nozzle 22 on the lower side of the drawingmember 51, after the container C has been molded and theblow nozzle 22 has been moved from its inserted position to its standby position. In the present modification, thesaucer moving unit 62 operates to move thesaucer 61 to below theblow nozzle 22, after the drawingmember moving unit 53 has moved the drawingmember 51 so that the drawingport 51b is positioned below theblow nozzle 22. - Thus, since the blow molding apparatus 1 according to the modification includes the
liquid receiving device 60, in addition to thedrawing device 50, even when the incompressible fluid adheres to theblow nozzle 22 during blow molding and drips down from theblow nozzle 22 when it is moved to its standby position, the dripped down incompressible fluid can be drawn into thedrawing passage 51a of the drawingmember 51 through the drawingport 51b. Besides, thesaucer 61 receives the incompressible fluid when it has dripped down after failing to be drawn by the drawingmember 51. In this way, the dripping down of the incompressible fluid onto the molded container C or themold 10 can be prevented even more reliably. - Further, in the blow molding apparatus 1 according to the modification, after the drawing
member moving unit 53 has moved the drawingmember 51 so that the drawingport 51b is positioned below theblow nozzle 22, thesaucer moving unit 62 moves thesaucer 61 to below theblow nozzle 22. Accordingly, it is possible to ensure that the timing of the movement of thesaucer 61 to below theblow nozzle 22 is after the dripping down of the incompressible fluid has been addressed at an early stage by the drawingmember 51 drawing the incompressibility fluid that drips down from theblow nozzle 22. For example, in a case in which the incompressible fluid that drips down from theblow nozzle 22 runs down in a thin stream extending from theblow nozzle 22 to the molded container C, the movement of thesaucer 61 to below theblow nozzle 22 is timed to coincide with the incompressible fluid, which runs in the thin stream, having being drawn by the drawingmember 51 and cut off. Thus, the incompressible fluid is prevented from adhering to a lower surface or the like of thesaucer 61 and dripping down onto the molded container C or themold 10. -
FIG. 10 is a sectional view illustrating a blow nozzle according to a modification. InFIG. 10 , the same reference numerals are assigned to members corresponding to those described above. - As illustrated in
FIG. 10 , theblow nozzle 22 may be configured to include drawingholes 70 on its inner peripheral surface. In the present modification, the inner peripheral surface of theblow nozzle 22 is provided with a plurality of drawingholes 70 that is arranged at an interval in the circumferential direction and that is also arranged at an interval in the axial direction. - These drawing holes 70 are each connected to a
drawing pump 72 via aflow passage 71 provided between theblow nozzle 22 and thebody block 21. The drawingpump 72 is configured by, for example, a vacuum pump, which can generate drawing force for drawing, into the respective drawing holes 70, the incompressible fluid adhered to theblow nozzle 22. - Additionally, the number or position of drawing
holes 70 provided in theblow nozzle 22 can be appropriately changed. - In the illustrated example, the
blow nozzle 22 is provided with a plurality of auxiliary drawing holes 73, in addition to the plurality of drawing holes 70. The plurality of auxiliary drawing holes 73 is open side by side at an interval from one another in the circumferential direction on a lower end surface of thenozzle body 22a of theblow nozzle 22. Eachauxiliary drawing hole 73 is connected to thedrawing pump 72 through theflow passage 71, as is the case with each drawinghole 70. The drawingpump 72 can generate drawing force for drawing, into the respective drawing holes 70 and also into the respective auxiliary drawing holes 73, the incompressible fluid adhered to theblow nozzle 22. - Additionally, the number or position of auxiliary drawing holes 73 provided in the
blow nozzle 22 can be changed in various ways. Further, theblow nozzle 22 may be configured to be provided only with the drawing holes 70 or the auxiliary drawing holes 73. - According to the
blow nozzle 22 of the modification that is configured as above, the incompressible fluid adhered to theblow nozzle 22 during blow molding can be drawn through the plurality of drawingholes 70 and auxiliary drawing holes 73. It is therefore possible to reduce the amount of the incompressible fluid that drips down from theblow nozzle 22 when it is moved to its standby position. Thus, the incompressible fluid can be even more reliably prevented from dripping down from theblow nozzle 22 and adhering to the molded container C or themold 10, by ensuring that the incompressible fluid that drips down from theblow nozzle 22 when it is moved to its standby position can be drawn by the drawingmember 51 of thedrawing device 50. - Needless to say, the present disclosure is not limited to the above embodiment, and various changes may be made without departing the gist of the present disclosure.
- For example, although in the above embodiment the blow
nozzle moving unit 40 is configured to move thenozzle unit 20 or theblow nozzle 22 upward with respect to themold 10, the present disclosure is not limited to this example. For example, themold 10 may be configured to be moved downward with respect to thenozzle unit 20 or theblow nozzle 22. Alternatively, thenozzle unit 20 or theblow nozzle 22, and themold 10 may be configured to be moved in a direction away from each other. - Further, the blow molding apparatus 1 may be configured without the
liquid receiving device 60, the drawing holes 70, or the auxiliary drawing holes 73. - Moreover, the blow molding apparatus 1 may be configured to perform a suck-back operation by which a predetermined amount of the incompressible fluid is sucked back from the inside of the molded container C toward the
supply flow path 23, by operating the pressurizedfluid supply unit 30 in an opposite direction after blow molding and immediately before theseal body 24 is closed. - Moreover, although in the above embodiment the
drawing device 50 and theliquid receiving device 60 are fixed to thenozzle unit 20, thedrawing device 50 and theliquid receiving device 60 may be fixed to a member or the like other than thenozzle unit 20. -
- 1
- Blow molding apparatus
- 10
- Mold
- 11
- Cavity
- 11a
- Opening
- 20
- Nozzle unit
- 21
- Body block
- 22
- Blow nozzle
- 22a
- Nozzle body
- 22b
- Holding portion
- 23
- Supply flow path
- 24
- Seal body
- 25
- Sealing claw portion
- 26
- Stretching rod
- 30
- Pressurized fluid supply unit
- 40
- Blow nozzle moving unit
- 50
- Drawing device
- 51
- Drawing member
- 51a
- Drawing passage
- 51b
- Drawing port
- 52
- Drawing pump
- 53
- Drawing member moving unit
- 53a
- Cylinder body
- 53b
- Piston rod
- 53c
- Guide
- 54
- Fixing bracket
- 55
- Holding plate
- 60
- Liquid receiving device
- 61
- Saucer
- 62
- Saucer moving unit
- 62a
- Cylinder body
- 62b
- Piston rod
- 62c
- Guide
- 70
- Drawing hole
- 71
- Flow passage
- 72
- Drawing pump
- 73
- Auxiliary drawing hole
- P
- Preform
- P1
- Body
- P2
- Neck ring
- P3
- Mouth tubular portion
- P4
- Undercut portion
- C
- Container
- O
- Central axis
Claims (4)
- A blow molding apparatus including:a mold for blow molding;a blow nozzle configured to be disposed above the mold;a pressurized fluid supply unit configured to supply a pressurized incompressible fluid to the blow nozzle; anda blow nozzle moving unit configured to cause a relative movement of the blow nozzle between a connected position in which the blow nozzle is connected to a mouth tubular portion of a preform that has been placed in the mold and a standby position in which the blow nozzle is upward and away from the mouth tubular portion, whereinthe preform is molded into a container having a shape corresponding to a cavity of the mold, by supplying the pressurized incompressible fluid into the preform through the blow nozzle which is in the connected position, the blow molding apparatus comprising:a drawing member including a drawing port;a drawing pump configured to be connected to the drawing member; anda drawing member moving unit configured to move the drawing member so that the drawing port is positioned below the blow nozzle, after the container has been molded and the blow nozzle has been moved from the connected position to the standby position.
- The blow molding apparatus according to claim 1, wherein the drawing port is open in a horizontal direction.
- The blow molding apparatus according to claim 1 or 2, further comprising:a saucer; anda saucer moving unit configured to move the saucer to below the blow nozzle on a lower side of the drawing member, after the container has been molded and the blow nozzle has been moved from the connected position to the standby position.
- The blow molding apparatus according to claim 3, wherein
after the drawing member moving unit has moved the drawing member so that the drawing port is positioned below the blow nozzle, the saucer moving unit moves the saucer to below the blow nozzle.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019103111A JP7221138B2 (en) | 2019-05-31 | 2019-05-31 | blow molding machine |
PCT/JP2020/009502 WO2020240972A1 (en) | 2019-05-31 | 2020-03-05 | Blow molding device |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3978222A1 true EP3978222A1 (en) | 2022-04-06 |
EP3978222A4 EP3978222A4 (en) | 2023-01-25 |
EP3978222B1 EP3978222B1 (en) | 2024-01-03 |
Family
ID=73553319
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20814846.0A Active EP3978222B1 (en) | 2019-05-31 | 2020-03-05 | Blow molding device |
Country Status (5)
Country | Link |
---|---|
US (1) | US11806916B2 (en) |
EP (1) | EP3978222B1 (en) |
JP (1) | JP7221138B2 (en) |
CN (1) | CN113924202B (en) |
WO (1) | WO2020240972A1 (en) |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2874734A (en) * | 1957-04-02 | 1959-02-24 | Gadget Of The Month Club Inc | Automatic container-filler device |
US5261566A (en) * | 1981-02-16 | 1993-11-16 | Tokyo Ohka Kogyo Co., Ltd. | Solution-dropping nozzle device |
IT1172681B (en) * | 1983-02-02 | 1987-06-18 | Ed Srl | IMPROVED EQUIPMENT SUITABLE FOR STERILY FILLING CONTAINERS WITH MATERIALS IN THE LIQUID OR PASTOUS STATE |
JPH07242214A (en) * | 1994-03-08 | 1995-09-19 | Ajinomoto Co Inc | Preventing charging machine from dripping of liquid |
CN100545041C (en) * | 2004-04-13 | 2009-09-30 | 花王株式会社 | Liquid applying nozzle |
FR2871093B1 (en) * | 2004-06-08 | 2007-11-16 | Sidel Sas | PROCESS AND INSTALLATION FOR MANUFACTURING CONTAINERS WITH COOLING AFTER FORMING |
JP5872361B2 (en) | 2012-03-30 | 2016-03-01 | 株式会社吉野工業所 | Blow molding apparatus and method for producing synthetic resin container |
EP2617650B1 (en) * | 2012-01-17 | 2014-08-20 | Nestec S.A. | Apparatus for blowing and filling a container with liquid collecting means |
JP6122762B2 (en) * | 2013-10-31 | 2017-04-26 | 株式会社吉野工業所 | Blow molding equipment |
JP6275581B2 (en) | 2014-07-31 | 2018-02-07 | 株式会社吉野工業所 | Blow molding equipment |
CN107614240B (en) * | 2015-03-13 | 2020-10-16 | 帝斯克玛股份有限公司 | Blow molding device |
JP6450617B2 (en) * | 2015-03-13 | 2019-01-09 | 株式会社吉野工業所 | Blow molding equipment |
JP6853759B2 (en) * | 2017-09-20 | 2021-03-31 | 株式会社吉野工業所 | Manufacturing method of liquid container |
CN111093942B (en) * | 2017-09-20 | 2021-09-14 | 株式会社吉野工业所 | Method for manufacturing container filled with liquid |
-
2019
- 2019-05-31 JP JP2019103111A patent/JP7221138B2/en active Active
-
2020
- 2020-03-05 CN CN202080039244.4A patent/CN113924202B/en active Active
- 2020-03-05 WO PCT/JP2020/009502 patent/WO2020240972A1/en unknown
- 2020-03-05 US US17/614,463 patent/US11806916B2/en active Active
- 2020-03-05 EP EP20814846.0A patent/EP3978222B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3978222B1 (en) | 2024-01-03 |
JP2020196181A (en) | 2020-12-10 |
CN113924202B (en) | 2023-12-01 |
EP3978222A4 (en) | 2023-01-25 |
US11806916B2 (en) | 2023-11-07 |
WO2020240972A1 (en) | 2020-12-03 |
JP7221138B2 (en) | 2023-02-13 |
US20220234273A1 (en) | 2022-07-28 |
CN113924202A (en) | 2022-01-11 |
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